Лако-красочные материалы — производство

Transparent cobalt blue (Color Index: Pigment Blue 28:77346) consists of minute, very thin, more or less hexagonal flakes. It is an ideal spinel with the composition MeIIMeIII2O4. The spinel structure is shown in Section 3.1.3. The primary particles have a diameter of ca. 20 to 100 nm and a thickness of ca. 5 nm. The […]

Transparent iron oxides have the same fastness properties as opaque iron oxide pig­ments, but much higher color strength and significantly higher color purity. Table 5.19 summarizes the properties of selected transparent iron oxide pigments [5.192]. Precipitation process 2 FeS04 + 4 NaOH + 0.5 02————— 2 FeOOH + 2 Na2S04 + H20 2 FeOOH ~Kt~* […]

Transparent yellow iron oxide is manufactured by precipitation ofiron(II) hydroxide or carbonate fromaverydilute iron(II) salt solution and subsequentoxidation, e. g. with air, to FeOOH. The quality is determined by parameters such as the concentration of the iron(II) salt during precipitation, precipitation temperature, oxidation time, pH and maturing time of the precipitated pigment particles in the […]

Figure 5.36 gives an overview of how the pigment properties of hematites are related to their particle sizes. Transparent iron oxides consist of nanoparticles with a primary particle size of 0.001 to 0.05 pm and are supplied in the yellow to red color range. Their applications include effect coatings (mixed with effect pigments), pure yellow […]

Transparent inorganic pigments are conveniently divided into two groups: colored and colorless. The colorless pigments, which do not absorb in the visible light range, are functional nano-materials with specific properties that are described in the sec­tions below. The colored pigments may also possess these functional properties. The transparency and hiding power resulting from the light […]

Powder coatings are absolutely free of organic solvents and should therefore be con­sidered as the most environmentally beneficial coating systems. In additional to the absence of solvents, the overspray can be recycled and reused, supporting the ecological targets even more. For the processing of metallic effect pigments in powder coatings, there are basi­cally three possible […]

Due to its chemical properties, aluminum reacts in aqueous systems, especially in alkaline or acidic media, to yield hydrogen gas. In the case of aluminum pigmented waterborne coatings, this would not only be a safety risk, but would also destroy the metallic effect [5.182]. This problem can easily be solved by using stabilized aluminum pigments. […]

For many years, the coatings and printing ink industry has been working hard, forced by legislation or national recommendations, to reduce the amount of organic solvents (VOCs) used. This can be achieved by increasing the solid content from low solids via high solids and “extra high solids” finally to solvent-free powder coatings. An alternative would […]

The most typical application of metal pigments (aluminum as well as gold bronze) in plastics is the tinting of masterbatches, which can be used for injection molding, blow molding, extrusion, calendering and other processing technologies for thermoplas­tics. However, they are also used in thermosetting materials like polyester putties, polyester and epoxy floorings, art objects and […]

In the field of printing inks and graphic arts, metal pigments are used in offset, gravure, flexographic, silk-screen and textile printing processes as well as in dusting works and different coating applications (paper, textile, leather, plastic). The metal pigments, gold bronze as well as aluminum, are supplied in the form of powders, pastes (including solvents), […]